EP0676898A1 - Frame sampling scheme for video scanning in a video-on-demand system - Google Patents

Frame sampling scheme for video scanning in a video-on-demand system

Info

Publication number
EP0676898A1
EP0676898A1 EP19950104098 EP95104098A EP0676898A1 EP 0676898 A1 EP0676898 A1 EP 0676898A1 EP 19950104098 EP19950104098 EP 19950104098 EP 95104098 A EP95104098 A EP 95104098A EP 0676898 A1 EP0676898 A1 EP 0676898A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
video
frames
segments
segment
method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19950104098
Other languages
German (de)
French (fr)
Other versions
EP0676898B1 (en )
Inventor
Ming-Syan Chen
Dilip Dinkar Kandlur
Philip Shi-Lung Yu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2387Stream processing in response to a playback request from an end-user, e.g. for trick-play
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/231Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
    • H04N21/2312Data placement on disk arrays
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television, VOD [Video On Demand]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47End-user applications
    • H04N21/472End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47202End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/173Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309Transmission or handling of upstream communications
    • H04N7/17318Direct or substantially direct transmission and handling of requests
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/173Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309Transmission or handling of upstream communications
    • H04N7/17336Handling of requests in head-ends

Abstract

A system and method for performing variable speed scanning or browsing, wherein a user controls the playout speed of a movie, which does not require additional disk or network bandwidth resources. In a preferred embodiment, the method provides for scanning operations for an MPEG video stream. The method satisfies the constraints of the MPEG decoder (in the users set-top box) and require a minimum of additional system resources. The embodiments of the present invention include (a) a storage method, (b1) a segment sampling method, (b2) a segment placement method, and (c) a playout method, where (b1) and (b2) are two alternatives for segment selection. Thus, two sets of solutions are provided to support vriable speed scanning in a disk-array-based video server: One using (a), (b1) and (c), and the other using (a), (b2) and (c).

Description

    Field of the Invention
  • [0001]
    The present invention relates to the support of video frame retrieval and scanning in a disk-array-based video server.
  • Related Art
  • [0002]
    In a video on demand (hereinafter, VOD) system, multimedia streams (movies) are stored on a storage server and played out to an end user (receiving) station upon request. The multimedia streams consist of compressed video and audio. The prevalent standard for the video is MPEG (Moving Picture Experts Group). Inter-frame compression techniques such as MPEG provide significant advantages in storage and transmission, and consequently they are universally accepted for VOD applications.
  • [0003]
    During normal playout, data blocks belonging to the multimedia stream are retrieved from the storage system and transmitted to the receiving station. The receiving station decodes the incoming stream and plays it out. In general, it is desirable to provide the user with VCR--like search functions such as "fast-forward" (also called "scan forward") in a VOD system. There are several conventional approaches to implementing this fast-forward (hereinafter, FF) function, some of which mimic the scan operation of an analog VCR or movie projector. However, each of these approaches imposes additional resource requirements on the system as explained below, where for ease of exposition, it is assumed that the movie has to be scanned at three times of the normal playout rate.
    • The multimedia stream is retrieved and transmitted at 3X of the normal playout rate, and the end station filters and plays out the data. This solution requires additional resources (3X the normal rate) at the storage system, the memory buffers, and the network. It also requires additional resources at the end station to process the incoming data.
    • The storage system retrieves and transmits every third frame to the end station. This solution requires a significant amount of additional system resources. The multimedia file must now be indexed to retrieve individual frames, and the amount of retrieved data is higher than normal due to the structure of the inter-frame coding.
    • The system switches over to a separately coded FF stream to provide the scan operation. This solution, though eliminating any additional read bandwidth or network bandwidth, is extremely expensive in terms of storage cost.
    Summary of The Invention
  • [0004]
    It is an object of this invention to support fast-forward and fast-backward (scanning) video frame retrieval in a disk-array-based video server.
  • [0005]
    It is a further object of this invention to support variable speed scanning in video server.
  • [0006]
    To avoid the previously described drawbacks, the present invention provides a system and method for performing variable speed scanning or browsing, wherein a user controls the playout speed of a movie, which does not require additional disk or network bandwidth resources.
  • [0007]
    In a preferred embodiment, the method provides for variable speed scanning operations for an MPEG video stream. The method satisfies the constraints of the MPEG decoder (in the users set-top box) and require a minimum of additional system resources. The embodiments of the present invention include (a) a storage method, (b1) a segment sampling method, (b2) a segment placement method, and (c) a playout method, where (b1) and (b2) are two alternatives for segment selection. Thus, two sets of solutions are provided to support variable speed scanning in a disk-array-based video server: One using (a), (b1) and (c), and the other using (a), (b2) and (c).
  • [0008]
    An MPEG video stream is composed of three types of frames: intra frames (I), predictive frames (P) and interpolated frames (B). The storage method divides a stream of MPEG video frames into media segments. Each segment comprises consecutive frames beginning with an I frame and ending before another I frame. Allocation and retrieval of the multimedia stream is in units of segments. Consecutive segments are stored on different disks in the disk array.
  • [0009]
    During normal playout, one media segment is retrieved from each disk in a disk array with, say n, disks. These n segments are buffered in memory and transmitted at a fixed rate to the receiving station. In order to preserve smooth operation during the FF mode, n consecutive segments in the scan sequence reside in n different disks.
  • [0010]
    The segment sampling method, which selectively retrieves segments from a disk array where segments are placed in a round-robin manner, supports segment sampling for FF retrieval, at any FF rate desired by viewers. The segments sampled by this method are uniformly distributed with a minimal variation on the number of segments skipped between every two consecutive retrievals.
  • [0011]
    The segment placement method is an alternative to the segment sampling method for segment selection. In contrast to the segment sampling method (that is used for a disk-array-based video server where segments are placed in a round-robin manner) the segment placement method allocates segments to disks judiciously such that no special provision is needed for sampling and the segments can be completely uniformly sampled in an scanning mode for some pre-determined scanning speeds.
  • [0012]
    The playout method operates the receiving station to play out the retrieved video stream for scanning retrieval. This method, by selectively parsing the incoming media stream and adjusting presentation time-stamps, minimizes the buffer space and the transmission bandwidth required by the server and the end station. These, and other objects, features and advantages of this invention will become apparent from the following detailed description of the invention taken in conjunction with the accompanying drawings.
  • Brief Description of the Drawings
  • [0013]
  • Fig. 1
    shows a disk-array-based multi-media video server in a network;
    Fig. 2
    is a block diagram for the procedure of fast-forward retrieval using the segment sampling method;
    Fig. 3
    is a block diagram for the procedure of fast-forward retrieval using the segment placement method;
    Fig. 4
    shows a sequence for of MPEG frames;
    Fig. 5
    shows a disk array where video segments are stored in a round robin manner;
    Fig. 6
    is a detailed flow diagram for a segment sampling method program;
    Fig. 7
    shows an example for the segment sampling method;
    Fig. 8
    is a detailed flow diagram for a segment placement method program;
    Fig. 9
    shows an example for the segment placement method; and,
    Fig. 10
    is a block diagram for the playout procedure.
    Detailed Description of A Preferred Embodiment
  • [0014]
    Fig. 1 shows a disk-array-based video server 100, wherein video data is stored in the disk array 102 and transmitted to the end client stations 103 over the network 104 upon request. The movies (videos) are stored on the disks 102. The video server 100 includes a processor (cpu) 101 which executes tasks under control of a cyclic schedular 106. These tasks include a retrieval task 150 which retrieves videos from the disks 102, a storage task 152 which stores videos temporarily in the memory buffer 105 and a transmission task 154 which transmits videos to client stations 103 by way of a communication network 104 via a network interface 107.
  • [0015]
    Each of the client stations 103 includes a network interface which provides bi-directional communication between the client station 103 and the video server video the communication network. The client stations also each include processor (cpu) 109 which receives videos via a client station network interface 108 into a playout buffer 110. Each client station 103 also includes a decoder 111 which receives movies from the playout buffer and decodes them for performance on the clients display equipment (such as a television set) and a control interface 112 which receives control commands (including scan speed control commands) from a user via a remote controller 114. These commands are communicated to the video server via the network interface 108 and the network 104.
  • [0016]
    The video server 100 can be embodied using any processor of sufficient performance for the number of video streams to be supported. For example, a small capacity video server could be embodied using an RISC System/6000 TM system while a larger capacity server could be embodied using an ES/9000 TM system (both available from International Business Machines Corporation of Armonk, New York). The disk array 102 can be of the RAID level 5 type. The communication network 103 can be, for example, a fiber optic network or a conventional bi-directional cable network. The client stations 103 can be embodied as a set-top box. The Remote control 114 and the control logic can be coupled by way of a conventional infra-red interface. The clients send commands to the server 103 by way of the network 104. In accordance with an embodiment of the present invention, the client can control the scan speed of the video (along a continuous spectrum) by depressing particular buttons on the remote controller 114.
  • [0017]
    For clarity, the example of fast forward operations will be used in this description. It should be understood however that the described principals apply equally to fast backward (FB) operations.
  • [0018]
    Fig. 2 illustrates one way to achieve the FF retrieval in a disk-array-based video server, using a storage method 10, a segment sampling method 15, and a playout method 20 according to an embodiment of the present invention. The storage method 10 divides a stream of MPEG video frames into media segments. Each segment comprises consecutive frames beginning with an I frame and ending before another I frame. Allocation and retrieval of the multimedia stream is in units of segments. The segment sampling method 15 selectively retrieves segments from a disk array where segments are placed in a round robin manner and performs fast forward (FF) retrieval at any fast forward speed desired by viewers. The playout method 20 causes the end station to play out the retrieved video stream from fast forward retrieval and maintains the same buffer space and transmission bandwidth requirement as in the normal play operation.
  • [0019]
    Fig. 3 illustrates another way to achieve the FF retrieval in a disk-array-based video server, using the storage method 10, the segment placement method 35, and the playout method 20 according to another embodiment of the present invention. The storage method 10 and the playout method 20 are the same as used in conjunction with the method of FIG. 2. The segment placement method 35 allocates segments to disks judiciously such that segments can be completely uniformly sampled in an FF mode for some predetermined FF speeds.
  • [0020]
    The various tasks and programs used to control scanning will now be described by reference to FIGs. 4-10.
  • [0021]
    Fig. 4 shows a sequence of MPEG video frames 1-8 that is composed of intra frames (I), predictive frames (P), and interpolated frames (B). The storage order of the frames, which differs from the temporal order, reflects the order in which the frames have to be delivered to the decoder. In the MPEG stream P frames depend on I frames, and B frames depend upon both I and P frames. Hence, it is not possible to play out B frames without the corresponding I and P frames. It is therefore not possible to play out every third frame to achieve 3X playout since this subset would include B frames without the corresponding anchor I or P frames.
  • [0022]
    For the foregoing reasons, the present storage method divides an MPEG video stream into media segments. Each segment includes consecutive frames beginning with an I frame and ending before another I frame. Allocation and retrieval of the multimedia stream is in units of segments. Consecutive segments are stored on different disks in the disk array 102.
  • [0023]
    The segment sampling method of the retrieval task 150 will now be described. Consider a disk-array-based video server of the type shown in FIG. 1 in which there are n disks. For the maximal throughput during the normal (standard playback speed) operation, video segments S0-S29 are stored in the disk array 102 in a round-robin manner so that n consecutive segments can be retrieved in one round. Formally, when there are n disks, segment g is stored in disk k=f1(g,n) where f1(g,n) = g mod n . Fig. 5 illustrates an example round-robin segment placement when n=10.
  • [0024]
    To achieve the FF feature, one has to appropriately sample some segments only, while skipping the others. The sampling rate depends upon the FF speed desired. If the FF speed is m times the normal speed, we would in average sample one segment out of m segments. For example, if the FF speed m equals 3, segments s0, s3, s6 and s9 will be retrieved from disk 0, disk 3, disk 6 and disk 9, respectively, in Fig. 5, while skipping segments s1, s2, s4, s5, s7 and s8. The complete sampling procedure will be described in more detail later by reference to the segment sampling method.
  • [0025]
    To provide the best output during FF, the segments sampled should be as uniformly distributed as possible. For example, to double the speed, one can simply select even segments while skipping the odd ones. However, it can be verified that this method, while uniformly sampling the segments, will not obtain the maximal throughput when there are an even number of disks in the array (such as the situation in Fig. 5 where n=10). Specifically, where only the even segments are selected, only half of the disks (i.e., disks with even numbers) participate in the segment retrieval whereas the other half disks (i.e., disks with odd numbers) remain idle. Consequently, to develop an FF video segment retrieval scheme in a disk array where segments are stored in a round-robin manner, we not only want to sample the segments as uniformly as possible but also need to ensure that the maximal throughput is attained. Such a procedure is described below.
  • [0026]
    Fig. 6 is a flow chart of a program in the retrieval task 150 for determining, for each disk, which video segment to retrieve in an FF mode. Suppose the number of disks in the array is n and the FF speed desired is m times as the normal operation. Let lcm(n,m) denote the least common multiple of m and n. For example lcm(3,9)=9 . Let z=nm/lcm(n,m) , for notational simplicity. To facilitate the description, an FF segment retrieval for n=9 and m=3 is given in Fig. 7, where the segments retrieved are marked with *'s.
  • [0027]
    Referring now to Fig. 6, the round number of segment retrieval, r, equals one in the beginning (step 60). Depending on whether r is an odd number or an even number, each disk will use proper formulas to determine the segment to retrieve (step 70). The case that r is an odd number corresponds to the first half of the zig-zag curve resulting from the segments retrieved, such as the line formed by segments 0*, 10* and 20* in the first round of Fig. 7. On the other hand, the case that r is an even number corresponds to the second half of the zig-zag curve, such as the line formed by segments 29*, 37* and 45* in the second round of Fig. 7. Specifically, if r is an odd number, segment g will be retrieved from disk k, where g is uniquely determined by steps 80 and 85. If r is an even number, segment g will be retrieved from disk k, where g is uniquely determined by steps 90 and 95. After segment g is retrieved from disk k retrieves in step 100, if more video segments are needed (step 105), go to step 110 and increase the round number r by one. Otherwise, this procedure ends in step 120.
  • [0028]
    Referring again to Fig. 7, the example for n=9 and m=3 is provided and those segments retrieved are marked with *'s. Instead of retrieving segments whose numbers are multiples of three (which would make disks 1, 2, 4, 5, 7 and 8 idle), the segment sampling scheme described in Fig. 6 shifts the video segments retrieved in some retrievals. For example, segment 10 is fetched instead of segment 9, and segment 20 is fetched instead of segment 19. Such shifting, though making the segments retrieved not perfectly uniformly distributed, ensures that the maximal throughput is achieved. The group of segments retrieved in the first round of retrieval in Fig. 7 consists of segments 0, 10, 20, 3, 13, 23, 6, 16 and 26, which are then displayed in the order of 0, 3, 6, 10#, 13, 16, 20#, 23, 26, where # indicates a shift for retrieved segment numbers. Under this scheme, the segments retrieved in the second round of retrieval in Fig. 7 are segments 45, 37, 29, 48, 40, 32, 51, 43, and 35, which are then displayed in the order of 29, 32, 35, 37#, 40, 43, 45#, 48, 51. It can be seen from Fig. 7 that the segments retrieved form a zig-zag curve. The number of shifts in a zig-zag is 2nm/lcm(n,m) - 2, which is the minimum among all FF schemes that could achieve the maximal throughput in a disk-array-based video server where segments are stored in a round-robin manner.
  • [0029]
    The segment placement method will now be described. As shown in Fig. 2 and Fig. 3, the segment placement method is an alternative to the segment sampling method previously described. In contrast to the segment sampling method (which selectively retrieves segments from a disk array in which segments are stored in a round-robin manner) the segment placement method allocates segments to disks judiciously such that no special provision is needed for sampling and the segment can be completely uniformly sampled in an FF mode for some pre-determined FF speeds. Consider an FF operation in which the playout rate is m times as the normal playout rates. In this FF mode, the sequence of retrieved segments from a given starting segment i is {i, i+m, i+2m, i+3m, ...}. Since n media segments are retrieved in each round, the segments to be retrieved are {(r-1)nm, (r-1)nm+m, (r-1)nm+2m, ..., (r-1)nm+(n-1)m}, where r is the round number of segment retrieval. It is necessary to ensure that these segments be mapped to different disks so as to have the maximal throughput. The segment placement function f2(g,n), defines a mapping from media segment g to a disk k, where k is a number ranging from 0 to n-1 in the disk array with n disks.
  • [0030]
    Assuming that m is a sub-multiple of the number of disks n, the mapping function can be defined as follows:
    f2(g,n) = (g + [g/n]) mod n. The first term (g) represents a regular scattering of the segments on the n disks and the second (g/n) represents a skew factor. It can be shown that f2(g,n) maps the segments {(r-1)nm, (r-1)nm+m, (r-1)nm+2m, ..., (r-1)nm+(n-1)m} to different disks for any r.
  • [0031]
    Referring now to Fig. 8 (which shows a flow chart of a segment placement program in the retrieval task 150), the round number of segment retrieval, r, equals one in the beginning (step 200). In the r-th round, disk k will locate its i-th disk (i.e., segment number g) to retrieve, where the numbers i and g are uniquely determined by steps 210 and 220, respectively. After segment g is retrieved from disk k in step 230, if more video segments are needed (step 240), go to step 250 and increase the round number r by one. Otherwise, this procedure ends in step 260.
  • [0032]
    Referring now to Fig. 9, the placement of video segments in a disk array with 6 disks when the required FF speed is three times as the normal operation is given. This layout of media segments across n disks ensures smooth retrieval for playout at different FF speeds if the FF speed-up m is a sub-multiple of the number of disks n. The layout ensures that the media segments to be retrieved in a round all reside in different disks, so that the load imposed on the storage system by the retrieval process in the FF mode is identical to the load under normal operation.
  • [0033]
    The playout method is now described. During the normal speed playout, video data is retrieved from the disk in rounds. In each round one media segment is retrieved from each disk in the disk array. The data is buffered temporarily in the server and transmitted at a fixed rate to the end station. In the FF mode, the server retrieves segments based on either the procedure in Fig. 2 or the one in Fig. 3. Referring now to Fig. 10, the processing steps of the receiving station that has the responsibility of parsing the incoming stream and creating a valid input stream for the decoder are given. The receiving end station 103 receives the incoming segment stream from the video server 100 in step 300, and discards intermediate frames that do not have the associated anchor frames in step 310. Note that although the media segment begins with an I frame, it contains B frames that have an anchor frame outside the media segment. These B frames are located immediately after the I frame as shown in Fig. 4, and are ignored since they depend on the last P frame in the preceding media segment which is not retrieved. In step 320 the receiving station adjusts the presentation time-stamps embedded in the stream. The presentation time-stamp determines the time at which a video frame is to be displayed. It has to be adjusted to compensate for the skipped segments and also for the dropped B frames, so as to reflect the correct playout time. Video frames are then played out in step 330.
  • [0034]
    This playout policy results in a piecewise continuous playout sequence. It allows the viewer to examine scenes in order to quickly locate the scene of interest. Since the segment size is fixed, no additional buffer or transmission bandwidth is required for the stream. The segment maintains the average data rate of the stream, and hence it is acceptable to the end station decoder.
  • [0035]
    Now that the invention has been described by way of the preferred embodiment, various modifications and improvements will occur to those of skill in the art. Thus, it should be understood that the preferred embodiment has been provided as an example and not as a limitation. The scope of the invention is defined by the appended claims.

Claims (15)

  1. A method of performing any of variable speed scanning operations in a video server wherein at least one data stream is provided from a mass storage media, comprising the steps of:
    receiving, by the video server, a performance request from a viewer for showing a particular video;
    transmitting a first data stream carrying the particular video from the video server to reception equipment at the viewer's location;
    receiving, by the video server, a scanning request including control data indicative of a scanning speed;
    identifying, as a function of the control data, particular frames of the video to be retrieved from the mass storage media;
    transmitting, to the viewers location, a second data stream consisting essentially of only the particular frames, instead of the first data stream.
  2. The method of Claim 1 wherein the frames are identified and encoded intra (I) frames, predictive frames and interpolated frames and stored in the mass storage media as units of retrieval each of the units of retrieval comprising consecutive ones of the frames beginning with an I frame and ending before another I frame.
  3. The method of Claim 1 wherein mass storage media is a disk array, the particular frames are also identified as a function of a number of disks in the array, the frames of the video are distributed among a plurality of disks in the disk array and wherein a plurality of the frames are retrieved from the disks in parallel.
  4. The method of Claim 1 wherein the storage media is an array of disks and comprising the further step of distributing the frames among the disks in the array as a function of a number of disks in the array and at least one predetermined scanning rate.
  5. The method of Claim 1 wherein mass storage media is a disk array, and wherein the frames of the video are distributed among a plurality of disks in the disk array and such that the particular frames are distributed evenly among the disks and wherein the total number of frames retrieved is the same as for transmission of the first data stream.
  6. The method of Claim 3 wherein the frames are stored as segments on the media and wherein each of the segments comprises a sequence of consecutive frames which can be decoded as a unit.
  7. A video-on-demand system, comprising:
    a user station having a video decoder, a control interface for receiving scan speed control commands from a user and a first network interface for receiving video data from the video server and for communicating the scan speed control commands to the video server;
    a video server having a mass storage media, a second network interface for sending the video data to the user station and for receiving the control commands from the user station; and, processing logic responsive to the control commands, for identifying particular frames of a video to be retrieved from the mass storage media and provided to the user station; and
    a communication network, coupled to the first network interface and the second network interface.
  8. The video-on-demand system of Claim 7 wherein the frames are stored as segments on the media and wherein each of the segments comprises a sequence of consecutive frames which can be decoded as a unit by the user station.
  9. A video server, comprising:
    a mass storage media for storing a plurality of videos;
    a network interface for sending video data to a user, for receiving a request for performance of one of the videos and scan speed control commands from the user; and,
    processing logic responsive to the control commands, for identifying particular frames of the one of the videos to be retrieved from the mass storage media and provided to the user, wherein particular frames of the video are skipped as a function of speed information embedded in the scan speed control commands.
  10. The video server of Claim 9 wherein the frames of the one of the videos are identified and encoded as intra (I) frames, predictive frames and interpolated frames and stored in the mass storage media as units of retrieval each of the units of retrieval comprising consecutive ones of the frames beginning with an I frame and ending before another I frame.
  11. The video server of Claim 9 wherein mass storage media is a disk array, the particular frames are also identified as a function of a number of disks in the array, the frames of the video are distributed among a plurality of disks in the disk array and wherein a plurality of the frames are retrieved from the disks in parallel.
  12. The video server of Claim 9 wherein the storage media is an array of disks and wherein the frames a distributed among the disks in the array as a function of a number of disks in the array and at least one predetermined scanning speed other than a normal playout speed.
  13. The video server of Claim 9 wherein the mass storage media is a disk array, and wherein the frames of the video are distributed evenly among disks in the disk array such that the number of frames retrieved during scanning is the same as for transmission of a video stream at normal playout speed.
  14. The video server of Claim 9 wherein the frames are stored as segments on the media and wherein each of the segments comprises a sequence of consecutive frames which can be decoded as a unit by a user station.
  15. A video server, comprising:
    an array of disks having a plurality of movies stored therein, each movie being stored in the array in units of retrival comprising consecutive intra (I) frames, predictive frames and interpolated frames, each unit of retrieval comprising consecutive ones of the frames beginning with an I frame and ending before another I frame;
    a network interface for sending video data to a user, for receiving a request for performance of one of the movies and scan speed control commands from the user; and,
    processing means responsive to the control commands, for identifying particular frames of the one of the movies to be retrieved from the mass storage media and provided to the user,
    retreival means for retrieving the particular frames of the one of the movies from the disks in parallel groups of the frames, wherein the number of frames retrieved in parallel from the disks during scanning is the same as for transmission of a video stream at normal playout speed.
EP19950104098 1994-04-04 1995-03-20 Frame sampling scheme for video scanning in a video-on-demand system Expired - Lifetime EP0676898B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08222781 US5521630A (en) 1994-04-04 1994-04-04 Frame sampling scheme for video scanning in a video-on-demand system
US222781 1994-04-04

Publications (2)

Publication Number Publication Date
EP0676898A1 true true EP0676898A1 (en) 1995-10-11
EP0676898B1 EP0676898B1 (en) 1999-10-20

Family

ID=22833653

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950104098 Expired - Lifetime EP0676898B1 (en) 1994-04-04 1995-03-20 Frame sampling scheme for video scanning in a video-on-demand system

Country Status (8)

Country Link
US (1) US5521630A (en)
EP (1) EP0676898B1 (en)
JP (1) JP3177111B2 (en)
KR (1) KR100188496B1 (en)
CN (1) CN1095571C (en)
CA (1) CA2142801C (en)
DE (2) DE69512818D1 (en)
ES (1) ES2137390T3 (en)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748123A2 (en) * 1995-06-07 1996-12-11 International Business Machines Corporation Multimedia server system and method for communicating multimedia information
WO1997003521A2 (en) * 1995-07-11 1997-01-30 Philips Electronics N.V. Video-on-demand system
DE19531847A1 (en) * 1995-08-29 1997-03-06 Sel Alcatel Ag Apparatus for storing video image data
DE19543017A1 (en) * 1995-11-18 1997-05-22 Thomson Brandt Gmbh A process for the production of picture sequences for a fast search operation in a film playback device, and apparatus for carrying out the method
DE19649813A1 (en) * 1996-03-01 1997-09-04 Olaf Cames Interactive transfer equipment for digitised video data
DE19610010A1 (en) * 1996-03-14 1997-09-18 Sel Alcatel Ag Device and service for the transmission of video image data, and means for transmitting request signals
DE19631939A1 (en) * 1996-08-08 1998-02-12 Sel Alcatel Ag Digital ISDN video server
US5739862A (en) * 1996-12-23 1998-04-14 Tektronix, Inc. Reverse playback of MPEG video
WO1998034405A1 (en) * 1997-01-30 1998-08-06 Microsoft Corporation Vcr-like functions rendering video on demand
WO1999057910A1 (en) * 1998-04-30 1999-11-11 Nokia Mobile Phones Limited A method for transmitting video images, a data transmission system and a multimedia terminal
US6014706A (en) * 1997-01-30 2000-01-11 Microsoft Corporation Methods and apparatus for implementing control functions in a streamed video display system
US6128653A (en) * 1997-03-17 2000-10-03 Microsoft Corporation Method and apparatus for communication media commands and media data using the HTTP protocol
EP1127460A1 (en) * 1998-10-05 2001-08-29 Panasonic Technologies, Inc. Algorithm for fast forward and fast rewind of mpeg streams
EP1178682A2 (en) * 2000-07-31 2002-02-06 Matsushita Electric Industrial Co., Ltd. Image recording and reproducing apparatus
US6415326B1 (en) 1998-09-15 2002-07-02 Microsoft Corporation Timeline correlation between multiple timeline-altered media streams
EP1331791A2 (en) * 2002-01-25 2003-07-30 DoCoMo Communications Laboratories USA, Inc. Method and system to support streaming proxy handoff during cacheable content delivery to mobile nodes in a packet based communication network
US6622171B2 (en) 1998-09-15 2003-09-16 Microsoft Corporation Multimedia timeline modification in networked client/server systems
US6868440B1 (en) 2000-02-04 2005-03-15 Microsoft Corporation Multi-level skimming of multimedia content using playlists
EP1553777A1 (en) * 1997-01-30 2005-07-13 Microsoft Corporation VCR-like functions rendering video on demand
US6985966B1 (en) 2000-03-29 2006-01-10 Microsoft Corporation Resynchronizing globally unsynchronized multimedia streams
US7149359B1 (en) 1999-12-16 2006-12-12 Microsoft Corporation Searching and recording media streams
US7174055B2 (en) 1999-01-28 2007-02-06 Kabushiki Kaisha Toshiba Image information describing method, video retrieval method, video reproducing method, and video reproducing apparatus
US7237254B1 (en) 2000-03-29 2007-06-26 Microsoft Corporation Seamless switching between different playback speeds of time-scale modified data streams
US7313808B1 (en) 1999-07-08 2007-12-25 Microsoft Corporation Browsing continuous multimedia content
US7496283B2 (en) 2002-06-28 2009-02-24 Microsoft Corporation Methods and systems for processing digital data rate and directional playback changes
US7539393B2 (en) 2003-12-05 2009-05-26 Microsoft Corporation Method and system for reverse playback of compressed data

Families Citing this family (67)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5720037A (en) * 1994-06-16 1998-02-17 Lucent Technologies Inc. Multimedia on-demand server
US6608966B1 (en) * 1994-10-07 2003-08-19 Intel Corporation VCR-type controls for video server system
US5721815A (en) * 1995-06-07 1998-02-24 International Business Machines Corporation Media-on-demand communication system and method employing direct access storage device
JP3184763B2 (en) 1995-06-07 2001-07-09 インターナショナル・ビジネス・マシーンズ・コーポレ−ション Multimedia direct access storage device and a formatting method
JP3154921B2 (en) * 1995-06-09 2001-04-09 富士通株式会社 Video playback position indexing scheme in a video-on-demand system
US5826110A (en) * 1995-06-19 1998-10-20 Lucent Technologies Inc. System for video server using coarse-grained disk striping method in which incoming requests are scheduled and rescheduled based on availability of bandwidth
JP3146937B2 (en) * 1995-07-13 2001-03-19 日本ビクター株式会社 Fast forward from the high-efficiency encoded video information to reproduce the fast reverse image reproducing method
US5659539A (en) * 1995-07-14 1997-08-19 Oracle Corporation Method and apparatus for frame accurate access of digital audio-visual information
US9832244B2 (en) * 1995-07-14 2017-11-28 Arris Enterprises Llc Dynamic quality adjustment based on changing streaming constraints
US7512698B1 (en) 1995-07-14 2009-03-31 Broadband Royalty Corporation Dynamic quality adjustment based on changing streaming constraints
US5822524A (en) * 1995-07-21 1998-10-13 Infovalue Computing, Inc. System for just-in-time retrieval of multimedia files over computer networks by transmitting data packets at transmission rate determined by frame size
JP2924739B2 (en) * 1995-10-30 1999-07-26 日本電気株式会社 Decoding system of the video data
US5732217A (en) 1995-12-01 1998-03-24 Matsushita Electric Industrial Co., Ltd. Video-on-demand system capable of performing a high-speed playback at a correct speed
EP0882358A2 (en) * 1996-02-20 1998-12-09 SAS Institute, Inc. Method and apparatus for transitions, reverse play and other special effects in digital motion video
US5959690A (en) * 1996-02-20 1999-09-28 Sas Institute, Inc. Method and apparatus for transitions and other special effects in digital motion video
JPH09271002A (en) * 1996-03-29 1997-10-14 Mitsubishi Electric Corp Video data distribution system
JPH1091360A (en) * 1996-09-12 1998-04-10 Fujitsu Ltd Disk control system
US6564262B1 (en) 1996-09-16 2003-05-13 Microsoft Corporation Multiple multicasting of multimedia streams
US6728775B1 (en) * 1997-03-17 2004-04-27 Microsoft Corporation Multiple multicasting of multimedia streams
US6115070A (en) * 1997-06-12 2000-09-05 International Business Machines Corporation System and method for DCT domain inverse motion compensation using shared information
US5845279A (en) * 1997-06-27 1998-12-01 Lucent Technologies Inc. Scheduling resources for continuous media databases
US6374336B1 (en) 1997-12-24 2002-04-16 Avid Technology, Inc. Computer system and process for transferring multiple high bandwidth streams of data between multiple storage units and multiple applications in a scalable and reliable manner
US6415373B1 (en) 1997-12-24 2002-07-02 Avid Technology, Inc. Computer system and process for transferring multiple high bandwidth streams of data between multiple storage units and multiple applications in a scalable and reliable manner
US7272298B1 (en) 1998-05-06 2007-09-18 Burst.Com, Inc. System and method for time-shifted program viewing
US7558472B2 (en) * 2000-08-22 2009-07-07 Tivo Inc. Multimedia signal processing system
US6233389B1 (en) 1998-07-30 2001-05-15 Tivo, Inc. Multimedia time warping system
US8577205B2 (en) 1998-07-30 2013-11-05 Tivo Inc. Digital video recording system
US8380041B2 (en) 1998-07-30 2013-02-19 Tivo Inc. Transportable digital video recorder system
US6807367B1 (en) 1999-01-02 2004-10-19 David Durlach Display system enabling dynamic specification of a movie's temporal evolution
KR100722707B1 (en) * 1999-01-06 2007-06-04 코닌클리케 필립스 일렉트로닉스 엔.브이. Transmission system for transmitting a multimedia signal
US6564005B1 (en) 1999-01-28 2003-05-13 International Business Machines Corporation Multi-user video hard disk recorder
US6760378B1 (en) * 1999-06-30 2004-07-06 Realnetworks, Inc. System and method for generating video frames and correcting motion
US7293280B1 (en) 1999-07-08 2007-11-06 Microsoft Corporation Skimming continuous multimedia content
US6928655B1 (en) * 1999-12-16 2005-08-09 Microsoft Corporation Live presentation searching
US7302490B1 (en) 2000-05-03 2007-11-27 Microsoft Corporation Media file format to support switching between multiple timeline-altered media streams
US20020023267A1 (en) * 2000-05-31 2002-02-21 Hoang Khoi Nhu Universal digital broadcast system and methods
US20020049980A1 (en) * 2000-05-31 2002-04-25 Hoang Khoi Nhu Controlling data-on-demand client access
US6557030B1 (en) 2000-05-31 2003-04-29 Prediwave Corp. Systems and methods for providing video-on-demand services for broadcasting systems
US20020059635A1 (en) * 2000-05-31 2002-05-16 Hoang Khoi N. Digital data-on-demand broadcast cable modem termination system
US20020175998A1 (en) * 2000-05-31 2002-11-28 Hoang Khoi Nhu Data-on-demand digital broadcast system utilizing prefetch data transmission
US20020026501A1 (en) * 2000-05-31 2002-02-28 Khoi Hoang Decreased idle time and constant bandwidth data-on-demand broadcast delivery matrices
US20020066100A1 (en) * 2000-05-31 2002-05-30 Khoi Hoang Method for providing data services for a large number of small-sized data files
US20030051249A1 (en) * 2001-08-20 2003-03-13 Khoi Hoang System and method for data insertion (commercials) in client generic data-on-demand broadcast transmissions
US6766376B2 (en) 2000-09-12 2004-07-20 Sn Acquisition, L.L.C Streaming media buffering system
US20020124259A1 (en) * 2000-09-27 2002-09-05 Chang Edward Y. Client-based interactive digital television architecture
US20030084461A1 (en) * 2001-10-25 2003-05-01 Khoi Hoang Method and apparatus for transmitting non-VOD services
US6738980B2 (en) * 2001-11-15 2004-05-18 Industrial Technology Research Institute Methods and systems for video streaming with VCR functionality
US8682939B2 (en) * 2002-05-22 2014-03-25 Teac Aerospace Technologies, Inc. Video and audio recording using file segmentation to preserve the integrity of critical data
US20050013589A1 (en) * 2003-07-14 2005-01-20 Microsoft Corporation Adding recording functionality to a media player
US20050155072A1 (en) * 2003-10-07 2005-07-14 Ucentric Holdings, Inc. Digital video recording and playback system with quality of service playback from multiple locations via a home area network
JP4114596B2 (en) 2003-11-19 2008-07-09 オンキヨー株式会社 Network av system
US7627227B2 (en) 2004-05-17 2009-12-01 Microsoft Corporation Reverse presentation of digital media streams
CN102665112B (en) 2004-11-19 2015-08-19 Tivo股份有限公司 A method and apparatus for the secure delivery and playback of multimedia content
US8601515B2 (en) * 2006-12-28 2013-12-03 Motorola Mobility Llc On screen alert to indicate status of remote recording
US8055779B1 (en) 2007-05-10 2011-11-08 Adobe Systems Incorporated System and method using data keyframes
US9979931B2 (en) * 2007-05-30 2018-05-22 Adobe Systems Incorporated Transmitting a digital media stream that is already being transmitted to a first device to a second device and inhibiting presenting transmission of frames included within a sequence of frames until after an initial frame and frames between the initial frame and a requested subsequent frame have been received by the second device
US8165450B2 (en) 2007-11-19 2012-04-24 Echostar Technologies L.L.C. Methods and apparatus for filtering content in a video stream using text data
US8136140B2 (en) 2007-11-20 2012-03-13 Dish Network L.L.C. Methods and apparatus for generating metadata utilized to filter content from a video stream using text data
US8165451B2 (en) * 2007-11-20 2012-04-24 Echostar Technologies L.L.C. Methods and apparatus for displaying information regarding interstitials of a video stream
US8606085B2 (en) * 2008-03-20 2013-12-10 Dish Network L.L.C. Method and apparatus for replacement of audio data in recorded audio/video stream
US8156520B2 (en) 2008-05-30 2012-04-10 EchoStar Technologies, L.L.C. Methods and apparatus for presenting substitute content in an audio/video stream using text data
US8407735B2 (en) * 2008-12-24 2013-03-26 Echostar Technologies L.L.C. Methods and apparatus for identifying segments of content in a presentation stream using signature data
US8510771B2 (en) * 2008-12-24 2013-08-13 Echostar Technologies L.L.C. Methods and apparatus for filtering content from a presentation stream using signature data
US8588579B2 (en) * 2008-12-24 2013-11-19 Echostar Technologies L.L.C. Methods and apparatus for filtering and inserting content into a presentation stream using signature data
US8437617B2 (en) * 2009-06-17 2013-05-07 Echostar Technologies L.L.C. Method and apparatus for modifying the presentation of content
US8934758B2 (en) 2010-02-09 2015-01-13 Echostar Global B.V. Methods and apparatus for presenting supplemental content in association with recorded content
US20110197224A1 (en) * 2010-02-09 2011-08-11 Echostar Global B.V. Methods and Apparatus For Selecting Advertisements For Output By A Television Receiver Based on Social Network Profile Data

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4949187A (en) * 1988-12-16 1990-08-14 Cohen Jason M Video communications system having a remotely controlled central source of video and audio data
US5119188A (en) * 1988-10-25 1992-06-02 Telaction Corporation Digital audio-video presentation display system
US5371532A (en) * 1992-05-15 1994-12-06 Bell Communications Research, Inc. Communications architecture and method for distributing information services

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5247347A (en) * 1991-09-27 1993-09-21 Bell Atlantic Network Services, Inc. Pstn architecture for video-on-demand services

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5119188A (en) * 1988-10-25 1992-06-02 Telaction Corporation Digital audio-video presentation display system
US4949187A (en) * 1988-12-16 1990-08-14 Cohen Jason M Video communications system having a remotely controlled central source of video and audio data
US5371532A (en) * 1992-05-15 1994-12-06 Bell Communications Research, Inc. Communications architecture and method for distributing information services

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
COMMUNICATIONS - RISING TO THE HEIGHTS, DENVER, JUNE 23 - 26, 1991, vol. 2 OF 3, 23 June 1991 INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 842-846, XP 000269608 GELMAN A D ET AL 'A STORE-AND-FORWARD ARCHITECTURE FOR VIDEO-ON-DEMAND SERVICE' *
ELECTRICAL COMMUNICATION, no. 4, 1993 PARIS, FR, pages 402-410, XP 000425706 HOFFMANN ET AL 'Video Compression Techniques for Multimedia Communications' *

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0748123A3 (en) * 1995-06-07 2005-12-21 International Business Machines Corporation Multimedia server system and method for communicating multimedia information
EP0748123A2 (en) * 1995-06-07 1996-12-11 International Business Machines Corporation Multimedia server system and method for communicating multimedia information
WO1997003521A2 (en) * 1995-07-11 1997-01-30 Philips Electronics N.V. Video-on-demand system
WO1997003521A3 (en) * 1995-07-11 2000-01-13 Philips Electronics Nv Video-on-demand system
US6020912A (en) * 1995-07-11 2000-02-01 U.S. Philips Corporation Video-on-demand system
DE19531847A1 (en) * 1995-08-29 1997-03-06 Sel Alcatel Ag Apparatus for storing video image data
US6031574A (en) * 1995-08-29 2000-02-29 Alcatel N.V. Device for storing video data
US5920675A (en) * 1995-11-18 1999-07-06 Deutsche Thomson-Brandt Gmbh Fast search operation in a film playback device
DE19543017A1 (en) * 1995-11-18 1997-05-22 Thomson Brandt Gmbh A process for the production of picture sequences for a fast search operation in a film playback device, and apparatus for carrying out the method
DE19649813A1 (en) * 1996-03-01 1997-09-04 Olaf Cames Interactive transfer equipment for digitised video data
DE19610010A1 (en) * 1996-03-14 1997-09-18 Sel Alcatel Ag Device and service for the transmission of video image data, and means for transmitting request signals
US6259471B1 (en) 1996-03-14 2001-07-10 Alcatel Apparatus and service for transmitting video data
US5905524A (en) * 1996-08-06 1999-05-18 Alcatel Alsthom Compagnie Generale D'electricite Digital ISDN video server
DE19631939A1 (en) * 1996-08-08 1998-02-12 Sel Alcatel Ag Digital ISDN video server
US5739862A (en) * 1996-12-23 1998-04-14 Tektronix, Inc. Reverse playback of MPEG video
US6014706A (en) * 1997-01-30 2000-01-11 Microsoft Corporation Methods and apparatus for implementing control functions in a streamed video display system
WO1998034405A1 (en) * 1997-01-30 1998-08-06 Microsoft Corporation Vcr-like functions rendering video on demand
EP1553777A1 (en) * 1997-01-30 2005-07-13 Microsoft Corporation VCR-like functions rendering video on demand
US6754715B1 (en) 1997-01-30 2004-06-22 Microsoft Corporation Methods and apparatus for implementing control functions in a streamed video display system
US7761585B2 (en) 1997-03-17 2010-07-20 Microsoft Corporation Techniques for automatically detecting protocols in a computer network
US6128653A (en) * 1997-03-17 2000-10-03 Microsoft Corporation Method and apparatus for communication media commands and media data using the HTTP protocol
US7664871B2 (en) 1997-03-17 2010-02-16 Microsoft Corporation Methods and apparatus for communication media commands and data using the HTTP protocol
US6526100B1 (en) 1998-04-30 2003-02-25 Nokia Mobile Phones Limited Method for transmitting video images, a data transmission system and a multimedia terminal
WO1999057910A1 (en) * 1998-04-30 1999-11-11 Nokia Mobile Phones Limited A method for transmitting video images, a data transmission system and a multimedia terminal
US6622171B2 (en) 1998-09-15 2003-09-16 Microsoft Corporation Multimedia timeline modification in networked client/server systems
US6415326B1 (en) 1998-09-15 2002-07-02 Microsoft Corporation Timeline correlation between multiple timeline-altered media streams
EP1127460A1 (en) * 1998-10-05 2001-08-29 Panasonic Technologies, Inc. Algorithm for fast forward and fast rewind of mpeg streams
EP1127460A4 (en) * 1998-10-05 2003-07-16 Matsushita Electric Corp Algorithm for fast forward and fast rewind of mpeg streams
US7174055B2 (en) 1999-01-28 2007-02-06 Kabushiki Kaisha Toshiba Image information describing method, video retrieval method, video reproducing method, and video reproducing apparatus
US7313808B1 (en) 1999-07-08 2007-12-25 Microsoft Corporation Browsing continuous multimedia content
US7149359B1 (en) 1999-12-16 2006-12-12 Microsoft Corporation Searching and recording media streams
US6868440B1 (en) 2000-02-04 2005-03-15 Microsoft Corporation Multi-level skimming of multimedia content using playlists
US6985966B1 (en) 2000-03-29 2006-01-10 Microsoft Corporation Resynchronizing globally unsynchronized multimedia streams
US7237254B1 (en) 2000-03-29 2007-06-26 Microsoft Corporation Seamless switching between different playback speeds of time-scale modified data streams
EP1178682A3 (en) * 2000-07-31 2004-03-17 Matsushita Electric Industrial Co., Ltd. Image recording and reproducing apparatus
US7099564B2 (en) 2000-07-31 2006-08-29 Matsushita Electric Industrial Co., Ltd. Image recording and selective reproducing apparatus
EP1178682A2 (en) * 2000-07-31 2002-02-06 Matsushita Electric Industrial Co., Ltd. Image recording and reproducing apparatus
EP1331791A2 (en) * 2002-01-25 2003-07-30 DoCoMo Communications Laboratories USA, Inc. Method and system to support streaming proxy handoff during cacheable content delivery to mobile nodes in a packet based communication network
EP1331791A3 (en) * 2002-01-25 2004-06-30 DoCoMo Communications Laboratories USA, Inc. Method and system to support streaming proxy handoff during cacheable content delivery to mobile nodes in a packet based communication network
US6907501B2 (en) 2002-01-25 2005-06-14 Ntt Docomo Inc. System for management of cacheable streaming content in a packet based communication network with mobile hosts
US8705942B2 (en) 2002-06-28 2014-04-22 Microsoft Corporation Methods and systems for processing digital data rate and directional playback changes
US8169345B2 (en) 2002-06-28 2012-05-01 Microsoft Corporation Methods and systems for processing digital data rate and directional playback changes
US7496283B2 (en) 2002-06-28 2009-02-24 Microsoft Corporation Methods and systems for processing digital data rate and directional playback changes
US7539393B2 (en) 2003-12-05 2009-05-26 Microsoft Corporation Method and system for reverse playback of compressed data

Also Published As

Publication number Publication date Type
DE69512818T2 (en) 2000-04-20 grant
KR100188496B1 (en) 1999-06-01 grant
US5521630A (en) 1996-05-28 grant
CN1095571C (en) 2002-12-04 grant
CA2142801A1 (en) 1995-10-05 application
EP0676898B1 (en) 1999-10-20 grant
ES2137390T3 (en) 1999-12-16 grant
JPH07284042A (en) 1995-10-27 application
DE69512818D1 (en) 1999-11-25 grant
JP3177111B2 (en) 2001-06-18 grant
CN1122480A (en) 1996-05-15 application
CA2142801C (en) 2001-10-16 grant

Similar Documents

Publication Publication Date Title
US7392532B2 (en) Interactive video programming methods
US6622305B1 (en) System and method for displaying near video on demand
US6144400A (en) Data delivery system, data receiving apparatus, and storage medium for video programs
US6519693B1 (en) Method and system of program transmission optimization using a redundant transmission sequence
US5701582A (en) Method and apparatus for efficient transmissions of programs
US5742347A (en) Efficient support for interactive playout of videos
US7274857B2 (en) Trick modes for compressed video streams
US6393158B1 (en) Method and storage device for expanding and contracting continuous play media seamlessly
US20040001500A1 (en) Predictive tuning to avoid tuning delay
US6621980B1 (en) Method and apparatus for seamless expansion of media
US20060277581A1 (en) Local entity and a method for providing media streams
US20080141317A1 (en) Systems and methods for media source selection and toggling
US6057832A (en) Method and apparatus for video-on-demand with fast play capability
US5973680A (en) Motion picture retrieval system
US20050028200A1 (en) Media content navigation associated advertising
US6804825B1 (en) Video on demand methods and systems
US20060244824A1 (en) Method and system of program transmission optimization using a redundant transmission sequence
US20080168503A1 (en) System and Method for Selecting and Viewing Broadcast Content Based on Syndication Streams
US6233735B1 (en) Near video-on-demand system and broadcasting method therefor
US20040034864A1 (en) Seamless digital channel changing
US7409140B2 (en) Channel buffering and display management system for multi-tuner set-top box
US20020147979A1 (en) Method and system for providing instant start multimedia content
US6965415B2 (en) EPG-conditioned letterbox-to-anamorphic conversion
US20060117359A1 (en) Fast Start-up for Digital Video Streams
US20020170059A1 (en) Universal STB architectures and control methods

Legal Events

Date Code Title Description
AK Designated contracting states:

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19960213

17Q First examination report

Effective date: 19980212

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: SE

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19991020

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19991020

AK Designated contracting states:

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 185941

Country of ref document: AT

Date of ref document: 19991115

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: DIPL.-ING. CHRISTIAN HEUSCH C/O INTERNATIONAL BUSI

REF Corresponds to:

Ref document number: 69512818

Country of ref document: DE

Date of ref document: 19991125

ITF It: translation for a ep patent filed

Owner name: BRAVI ALFREDO DR.

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2137390

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 20090216

PGFP Postgrant: annual fees paid to national office

Ref country code: BE

Payment date: 20090427

Year of fee payment: 15

BERE Be: lapsed

Owner name: *INTERNATIONAL BUSINESS MACHINES CORP.

Effective date: 20100331

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100331

PGFP Postgrant: annual fees paid to national office

Ref country code: IT

Payment date: 20110310

Year of fee payment: 17

PGFP Postgrant: annual fees paid to national office

Ref country code: ES

Payment date: 20110228

Year of fee payment: 17

Ref country code: CH

Payment date: 20110627

Year of fee payment: 17

PGFP Postgrant: annual fees paid to national office

Ref country code: NL

Payment date: 20110404

Year of fee payment: 17

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20121001

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120331

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120331

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120320

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20121001

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20130710

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120321

PGFP Postgrant: annual fees paid to national office

Ref country code: DE

Payment date: 20140325

Year of fee payment: 20

PGFP Postgrant: annual fees paid to national office

Ref country code: FR

Payment date: 20140317

Year of fee payment: 20

PGFP Postgrant: annual fees paid to national office

Ref country code: GB

Payment date: 20140326

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69512818

Country of ref document: DE

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20150319

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20150319